B Gravitational waves - Mass interaction quesiton

Hey all. Since gravitational waves travel at the speed of light, when they are "escaping" from mass, doe's their intensity lower? If so what mass would be needed to completely absorb a gravitational wave given the wave's properties? Any help appreciated.

A wave can't really be "completely absorbed". Consider the analogy with electromagnetism: an object absorbs EM waves if it can take their energy and turn it into heat--i.e., into vibrations of its atoms (or molecules). But that heat will gradually get transferred, and at least part of it will go into EM radiation again--for example, objects at room temperature emit (mainly) infrared radiation, i.e., EM waves. So the original EM waves didn't get "completely absorbed"; they just got converted into other EM waves.

Similarly, a mass might convert the energy of incoming gravitational waves into heat, but that heat will get radiated away again, and some of it (at least in principle) will be radiated as gravitational waves again. So the gravitational waves won't get "completely absorbed".